RSTS/E CSR Access in MACRO

I've been attempting to do some macro programming of the DEQNA Ethernet card under RSTS/E. All of the system calls to actually send/receive packetes seem to be very well documented and fairly easy to use. What I can't find in any of the manuals (or on the net) is a system call that will return the card's MAC address. I know that the MAC address is the first six bytes of the CSR. However, I'm not sure how to go about accessing the device's CSR from within RSTS/E. Ideally, I'd use a subroutine that would return any network card's MAC given its type (XH or XE) and unit number. I know that I can't be the first person to have ever tried to do this, so I'm turning to those who should know - you guys. Any help would be greatly appreciated. -- Christopher L McNabb Operating Systems Analyst Email: cmcnabb(a)4mcnabb.net Virginia Tech ICBM: 37.1356N 80.4272N GMRS: WPSR255 ARS: N2UX Grid Sq: EM97SD